Indentation damage and crack repair in human enamel.
Fecha
2013-05-01
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ELSEVIER SCIENCE BV
Resumen
Tooth enamel is the hardest and most highly mineralized tissue in the human body. While there have been a number of studies aimed at understanding the hardness and crack growth resistance behavior of this tissue, no study has evaluated if cracks in this tissue undergo repair. In this investigation the crack repair characteristics of young human enamel were evaluated as a function of patient gender and as a function of the distance from the Dentin Enamel Junction (DEJ). Cracks were introduced via microindentation along the prism direction and evaluated as a function of time after the indentation. Microscopic observations indicated that the repair of cracks began immediately after crack initiation and reaches saturation after approximately 48 h. During this process he crack length decreased up to 10% of the initial length, and the largest degree of reduction occurred in the deep enamel, nearest the DEJ. In addition, it was found that the degree of repair was significantly greater in the enamel of female patients.
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Palabras clave
Crack repairs, Crack-growth resistance, Degree of reduction, Dentin-enamel junctions, Indentation damage, Micro indentation, Microscopic observations, Mineralized tissue, Brittleness, Cracks, Enamels, Fracture mechanics, Hardness, Tissue, Tooth enamel, Toughness, Repair, adult, article, dental etching, dental procedure, enamel, female, hardness, human, major clinical study, male, molar tooth, priority journal, room temperature, tooth fracture, Adolescent, Computer Simulation, Dental Enamel, Female, Hardness, Humans, Male, Materials Testing, Models, Biological, Models, Chemical, Molar, Third, Stress, Mechanical, Surface Properties, Young Adult